A. O. SMITH GCRL-50 4**

This figure is not a registry entry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, and the daily hot-water draw that the DOE test assigns to the high draw pattern. The registry lists a UEF of 0.62 for this unit, and the DOE CCD data was retrieved on 2026-09-19. The result applies to natural gas at that draw only. Real use in a home with a different draw is not covered by it. Against the class, the unit ranks 367th lowest in energy use of 414 models, which puts it in the highest quarter of its class for energy use. The method behind the calculation is documented separately.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The unit's first hour rating, the gallons of hot water available in the first hour from a full tank, is 81 gallons on a rated volume of 50 gallons. The registry does not say whether that meets a given household's demand, so this page does not either. The figure suits a reader confirming this unit's energy use within its registered class. It does not suit a reader who ranks only by low energy use, since the unit sits 13 therms above the class median of 260 therms. A smaller household tested at another draw pattern cannot apply this figure; the selector by fuel, space and size lists other options.

The running cost is not written in the text because it depends on the state average residential gas price, which differs by reader. Multiplying 273 therms by the price per therm in your state gives the yearly gas cost at the high draw pattern. The same rate applied to the 13 therms gap shows what sitting above the class median of 260 therms costs. The cost calculator for your own ZIP does this arithmetic. The modeled installed-cost range appears in its own block with its source and date; it is a modeled range, not a quote. To compare against a unit of the same class, find a same-class replacement by model number, starting from GCRL-50 4**.